package com.atguigu.springcloud.service;

import cn.hutool.core.util.IdUtil;
import com.netflix.hystrix.contrib.javanica.annotation.HystrixCommand;
import com.netflix.hystrix.contrib.javanica.annotation.HystrixProperty;
import org.springframework.stereotype.Service;
import org.springframework.web.bind.annotation.PathVariable;

import java.util.concurrent.TimeUnit;

/**
 * @auther gxnualbert
 * @create 2021-04-23-22:09
 */

@Service
public class PaymentService {

    /**
     * 正常访问，肯定OK
     *
     * @param id
     * @return
     */
    public String paymentInfo_OK(Integer id) {
        return "线程池:  " + Thread.currentThread().getName() + "  paymentInfo_OK,id:  " + id + "\t" + "O(∩_∩)O哈哈~";
    }

    @HystrixCommand(fallbackMethod = "paymentInfo_TimeOutHandler"/*指定善后方法名*/, commandProperties = {
            @HystrixProperty(name = "execution.isolation.thread.timeoutInMilliseconds", value = "5000")
    })
    public String paymentInfo_TimeOut(Integer id) {
        /**
         * 故意模拟超时，，触发降级。 只要出现异常一种场景，都可触发降级
         * 1.程序运行异常
         * 2.超时
         * 3.服务熔断触发降级
         * 4.线程池，信号量打满也会导致服务降级
         *
         *
         */
        int timenout = 3; //模拟这是一个复杂的业务流程，需要20秒钟
        try {
            TimeUnit.SECONDS.sleep(timenout);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        return "线程池:  " + Thread.currentThread().getName() + "payment time out---hystrix id:  " + id + "\t" + "O(∩_∩)O哈哈~" + "  耗时(秒): " + timenout;

//        int age = 10 / 0;
//        return "线程池:  "+Thread.currentThread().getName()+"payment time out---hystrix id:  "+id+"\t"+"O(∩_∩)O哈哈~"+"  耗时(秒): ";
    }

    //用来善后的方法
    public String paymentInfo_TimeOutHandler(Integer id) {
        return "线程池:  " + Thread.currentThread().getName() + " paymentInfo_TimeOutHandler 8001系统繁忙或者运行报错，请稍后再试,id:  " + id + "\t" + "o(╥﹏╥)o";
    }


    //=====服务熔断
    @HystrixCommand(fallbackMethod = "paymentCircuitBreaker_fallback",commandProperties = {
            @HystrixProperty(name = "circuitBreaker.enabled",value = "true"),// 是否开启断路器
            @HystrixProperty(name = "circuitBreaker.requestVolumeThreshold",value = "10"),// 请求次数
            @HystrixProperty(name = "circuitBreaker.sleepWindowInMilliseconds",value = "10000"), // 时间窗口期
            @HystrixProperty(name = "circuitBreaker.errorThresholdPercentage",value = "60"),// 失败率达到多少后跳闸
    })
    public String paymentCircuitBreaker(@PathVariable("id") Integer id) {
        if(id < 0) {
            throw new RuntimeException("******id 不能负数");
        }
        String serialNumber = IdUtil.simpleUUID();

        return Thread.currentThread().getName()+"\t"+"调用成功，流水号: " + serialNumber;
    }
    public String paymentCircuitBreaker_fallback(@PathVariable("id") Integer id) {
        return "id 不能负数，请稍后再试，/(ㄒoㄒ)/~~   id: " +id;
    }

}
